Spade drill



7 Oct. 8, 1963 B G. HANSON SPADE DRILL Filed Nov. 7, 1961 Berger 6. Hanson 1N VEN TOR. 403 BY flaw -Mag,

United States Patent 3,106,112 SPADE DRILL Berger G. Hanson, Tucson, Ariz., assignor of fifty percent to Thomas (I. Sulkoske, Tucson, Ariz. Filed Nov. 7, 1961, Ser- No. 159,805 13 Claims. (Cl. 77-67) This invention relates to new and useful improvements in drills particularly for bowling balls and has for its primary object to provide, in a manner as hereinafter set forth, a tool of this character comprising a cutting bit which is readily removable whereby bits of various sizes may be conveniently used on the basic tool.

Another highly important object of the present invention is to provide an improved drill of the aforementioned character comprising novel means for locking the bit in position on the arbor.

Still another important object of the invention is to provide a drill of the character described which is readily usable either in a conventional taper socket or in a straight shank chuck.

Another object of this invention is to provide an improved drill of the character set forth which may be quickly assembled or disassembled.

Other objects of the invention are to provide adrill of the character described which will be comparatively simple in construction, strong, durable, compact, of light weight, accurate and which may be manufactured at low cost.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawing forming a part hereof, wherein like numerals refer to like parts throughout, and in which:

FIGURE 1 is a perspective view, showing a drill embodying the present invention;

FIGURE 2 is a perspective view of the cutting bit;

FIGURE 3 is a vertical sectional view through the assembled tool:

FIGURE 4 is a view in horizontal section, taken substantially on the line 44 of FIGURE 3;

FIGURE 5 is a view in horizontal section, taken substantially on the line 55 of FIGURE 3;

FIGURE 6 is a view in horizontal section substantially similar to FIGURE 5 but showing the locking means in operative position; and

FIGURE 7 is a vertical sectional view through the lower end portion or" the assembly, taken substantially on the line 7-7 of FIGURE 3.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises an arbor 8 of suitable metal, which arbor may also be of any desired dimensions. The arbor 8 includes an outer member in the form of a tube or sleeve 9 having extending longitudinally into its lower end portion a kerf or slot 10 providing opposed bifurcations 11. A flat bar or plate 12 extends between the bifurcations 11 at an intermediate point. Adjacent the inner end of the kerf or slot 16 the sleeve 9 is further provided with short, diametrically opposite circumferential slots 13 the purpose of which will be presently set forth.

The sleeve 9 further includes an enlarged upper end portion providing a shank 14. The shank 14 terminates in a reduced, externally threaded upper end portion 15. In the assembly shown, the tool is mounted in the conventional taper socket 165. The socket 16 includes the usual internally threaded portion 17 which receives the portion of the shank 14.

Mounted for oscillation in the sleeve 9 is an inner member providing a locking shaft 18. Fixed diametrically "ice in the lower end portion of the shaft 18 is a locking pin 19 the end portions of which provide projections which are operable in the slots 13, said end portions projecting beyond the periphery of the sleeve 9.

Mounted for oscillation on the lower portion of the shank 14, immediately adjacent the shoulder 20 provided thereby, is a hexagonal ring or collar 21. The colar 21 is operatively connected by a diametrically extending pin 22 to the shaft 18 for actuating said shaft, said pin being operable in short, diametrically opposite circumferential slots 24 (FIGURE 4) provided therefor in the shank 14.

Removably mounted on the lower end portion of the arbor 8 is a cutting bit 25 of suitable metal, which bit may be of any desired size. The bit 25 is of substantially the shape shown and the cutting edges thereof comprise high grade carbide tips 26. The bit 25 is insertable in the kerf or slot 19 astride the bar or plate 12. Toward this end, the bit 25 has extending downwardly thereinto from the upper end thereof a recess or slot 26 providing bifurcations 27. The slot 26 includes a reduced lower portion 28 providing shoulders 29. The slot 26 receives the lower portion of the sleeve 2 adjacent the upper end of the kerf or slot 10 and the shoulders 29 abut the lower end of said sleeve between the bifurcations 11. The reduced slot portion 28 receives the bar or plate 12. The upper end portions of the bifurcations 27 have formed therein opposed notches or slots 36 which receive the projected end portions of the pins 9 for releasably locking the bit on the arbor. 7

It is thought that the manner of assembling the tool will be readily apparent from a consideration of the foregoing. Briefly, with the pin 19 in inoperative position as shown in FIGURE 6 of the drawing, the bit 25 is slipped longitudinally into the kerf 10 between the bifurcations 11, said bit straddling the bar or plate 12 with the upper end portions of the bifurcations 27 receiving the sleeve 9 therebetween. Through the medium of the collar 21 the shaft 18 is then turned in a direction to engage the end portions of the pin 19 in the notches 30 as shown in FIGURE 5 of the drawing. Thus, the bit 25 is positively but removably secured in position on the arbor 8. Of course, to remove the bit 25 as when another size is desired, the foregoing procedure is substantially reversed. The shank 14 may be screwed into a standard Morse taper socket 16, as shown. Or, the taper socket 16 may be removed and the tool inserted for use in a straight shank chuck. The construction and arrangement of parts is such as to ensure maximum strength, durability and precise hole size.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A drill comprising an arbor including a. sleeve, said sleeve comprising bifurcations on one end defining a kerf, said arbor further including :a shaft rotatable in the sleeve, a removable bit mounted longitudinally on the arbor in the kerf and comprising bifurcations receiving the sleeve therebetween and defining a slot, and a locking pin on the shaft engageable with the second-named bifurcations in response to rotation of said shaft for securing the bit on the arbor.

2. A drill in accordance with claim 1, said secondnamed bifurcations having opposed notches therein for the reception of the end portions of the pin.

3. A drill in accordance with claim 1, said sleeve further comprising a bar extending between the first-named bifurcations and engaged in the slot.

4. A drill in accordance with claim 1, said sleeve having circumferential slots therein adjacent the kerf, said pin being operable in the last-named slots.

5. A drill in accordance with claim 1, said sleeve having diametrically opposite, circumferential slots therein, a manually operable collar rotatable on the sleeve, and a pin operable in the slots and operatively connecting said collar to the shaft for locking or releasing the bit.

6. A drill comprising an arbor including relatively rotatable inner and outer members, one of said members having a kerf therein, a blade mounted in the ker-f, and means on the other member for locking the blade in the kerf in response to relative rotation of the members.

7. A drill in accordance with claim 6, said means including projections on said other member operatively engagealble with the blade.

8. A drill in accordance With claim 7, said blade including bifurcations straddling said one member and engageable by the projections for anchoring said blade in the kerf.

9. A drill according to claim 8, wherein the bifurcations have notches therein for receiving the projections.

10. A dn'll according to claim 9', said one member having slots therein communicating with the notches, said project-ions being operable in the slots for limiting relati-ve rotation of the members.

11. A drill in accordance with claim 6, together with means for relatively rotating the members.

12. A drill in accordance with claim ll, said one memher having circumferential slots therein, the last-named means comprising a collar rotatably mounted on said one member, and a pin fixed diametrically in the collar and the other member and operable in the slots.

13. A drill comprising an arbor including bifurcations on one end defining a lcerf, a bit mounted in the kerf and including bifurcations receiving the arbor therebetween, and means on the arbor engageable with the bit bifurcations for locking the bit in the kerf.

References Cited in the file of this patent UNITED STATES PATENTS 1,156,336 VVegland Oct. 12, 1915 

1. A DRILL COMPRISING AN ARBOR INCLUDING A SLEEVE, SAID SLEEVE COMPRISING BIFURACATIONS ON ONE END DEFINING A KERF, SAID ARBOR FURTHER INCLUDING A SHAFT ROTATABLE IN THE SLEEVE, A REMOVABLE BIT MOUNTED LONGITUDINALLY ON THE ARBOR IN THE KERF AND COMPRISING BIFURCATIONS RECEIVING THE SLEEVE THEREBETWEEN AND DEFINING A SLOT,AND A LOCKING PIN ON THE SHAFT ENGAGEABLE WITH THE SECOND-NAMED BIFURCATIONS IN RESPONSE TO ROTATION OF SAID SHAFT FOR SECURING THE BIT ON THE ARBOR. 